Auto DevOps should use helm chart

Description

We currently create Kubernetes configuration by interpolating variables inside inline k8s object YAML. We should use helm charts instead.

Proposal

Option 1. Move kubernetes object configuration into helm chart file in kubernetes-auto-deploy.

Option 2. Use external helm chart auto-deploy-app from charts.gitlab.io. This may extend well into https://gitlab.com/gitlab-org/gitlab-ce/issues/29969 if we let people specify their own helm chart via a project variable. This way they could specify their own stable chart, a private chart, or even a local filesystem chart. But it would default to gitlab/auto-deploy-app.

Links / references

• Related: https://gitlab.com/gitlab-org/gitlab-ce/issues/29969

Documentation blurb

GitLab 9.3 adds support for leveraging Helm Charts when using Auto Deploy.

(Write the start of the documentation of this feature here, include:

1. Why should someone use it; what's the underlying problem.
2. What is the solution.
3. How does someone use this

During implementation, this can then be copied and used as a starter for the documentation.)

mentioned in issue #29969 (closed)

added auto devops deploy labels

mentioned in issue gitlab-examples/kubernetes-deploy#7 (closed)

mentioned in issue #32638 (moved)

mentioned in issue #32829 (closed)

Initial Merge Request "bundling" Helm with scripts: https://gitlab.com/gitlab-examples/kubernetes-deploy/merge_requests/14.

The truth is that we could get the chart/ folder out of this repository and publish it outside.

There are a few things that needs to be improved:

1. Install of Helm Tiller,
2. Generation of kubeconfig (will be addressed in %9.4),
3. We should also probably ensure (maybe from GitLab) that Kubernetes namespace is created,
4. We should remove the manual expansion of CI_ENVIRONMENT_URL as this will be supported in %9.3,
5. We should figure out a way to improve a build script, as this is not really something that could be done by Helm.

assigned to @ayufan

The deployed chart is unfortunately incompatible with previously generated deployments.

PostgreSQL supports data persistence.

changed milestone to %9.4

changed milestone to %9.5

It was not merged in time ;(

marked this issue as related to #32829 (closed)

changed milestone to %10.0

added Deliverable label

added In review label

changed title from Auto Deploy should use helm chart to Auto DevOps should use helm chart

mentioned in merge request gitlab-ci-yml!88 (merged)

Closed by https://gitlab.com/gitlab-org/gitlab-ci-yml/merge_requests/88

closed